1defragfs.ocfs2(8)             OCFS2 Manual Pages             defragfs.ocfs2(8)
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NAME

6       defragfs.ocfs2 - online defragmenter for ocfs2 filesystem
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SYNOPSIS

9       defragfs.ocfs2 [-c] [-v] [-l] [-g] [-h][target]...
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DESCRIPTION

12       defragfs.ocfs2 reduces fragmentation of ocfs2 based file. The file tar‐
13       geted by defragfs.ocfs2 is created on  ocfs2  filesystem  The  targeted
14       file gets more contiguous blocks and improves the file access speed.
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16       target  is  a regular file, a directory, or a device that is mounted as
17       ocfs2 filesystem.  If target is  a  directory,  defragfs.ocfs2  reduces
18       fragmentation of all files in it. If target is a device, defragfs.ocfs2
19       gets the mount point of it and reduces fragmentation of  all  files  in
20       this mount point.
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OPTIONS

23       -c     Print the numbers of files that should be processed
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25       -v     verbose  mode,  the  current  fragmentation  count and the ideal
26              fragmentation count are printed for each file.
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28              If this option is specified, target is never defragmented.
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30       -l     defragfs.ocfs2 will run in low io mode, which means it will reg‐
31              ularly yield cpu to allow other processes to run.
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33       -g     defragfs.ocfs2  regularly records the current progress. So if it
34              is interrupted, the next time you run defragfs.ocfs2  with  this
35              option, it will resume from the recorded progress.  Note that if
36              this option is specified, other options are ignored and replaced
37              by those that were recorded.
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39       -h     Print help info
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NOTES

43       defragfs.ocfs2  does  not  support  files in lost+found directory. When
44       target is a device or a mount point, defragfs.ocfs2 doesn't  defragment
45       files in mount point of other device.
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47       It  is completely not recommended to run against a file while it is ac‐
48       tively in another application.  Since the read/write of a file involves
49       a  dlm  lock,  this  can  result  in a performance slowdown to both de‐
50       fragfs.ocfs2 and the application due to contention.
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52       If the file system's free space is fragmented, or if there is  insuffi‐
53       cient  free  space available, defragfs.ocfs2 may not be able to improve
54       the file's fragmentation.
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56       Non-privileged users can execute  defragfs.ocfs2  to  their  own  file.
57       Therefore, it is desirable to be executed by root user.
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AUTHOR

60       Written by Larry Chen <lchen@suse.com>
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65Version 1.8.7                    January 2012                defragfs.ocfs2(8)
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